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  <title>Clear watcher pending status</title>
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 <div class="refnamediv">
  <h1 class="refname">EvWatcher::clear</h1>
  <p class="verinfo">(PECL ev &gt;= 0.2.0)</p><p class="refpurpose"><span class="refname">EvWatcher::clear</span> &mdash; <span class="dc-title">Clear watcher pending status</span></p>

 </div>
 <div class="refsect1 description" id="refsect1-evwatcher.clear-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="modifier">public</span>
   <span class="methodname"><strong>EvWatcher::clear</strong></span>(): <span class="type">int</span></div>

  <p class="para rdfs-comment">
   If the watcher is pending, this method clears its
   <var class="varname">pending</var>
   status and returns its
   <var class="varname">revents</var>
   bitset(as if its callback was invoked). If the watcher isn&#039;t pending
   it does nothing and returns
   <strong><code>0</code></strong>
   .
  </p>
  <p class="para">
   Sometimes it can be useful to &quot;poll&quot; a watcher instead of waiting for its
   callback to be invoked, which can be accomplished with this function.
  </p>
 </div>

 <div class="refsect1 parameters" id="refsect1-evwatcher.clear-parameters">
  <h3 class="title">参数</h3>
  <p class="para">此函数没有参数。</p>
 </div>

 <div class="refsect1 returnvalues" id="refsect1-evwatcher.clear-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   In case if the watcher is pending, returns
   <var class="varname">revents</var>
   bitset as if the
   <a href="ev.watcher-callbacks.html" class="link">watcher callback</a>
   had been invoked. Otherwise returns
   <strong><code>0</code></strong>
   .
  </p>
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